Whoop whoop whoop . . . Any ideas please?

We’ve been hearing this whoop whoop whoop. . . call during the day.

I’ve looked fairly extensively and can’t seem to find out what it might be. Sounds similar to a Great Grey Owl call I found on YouTube. Although I appreciate its not likely to be that in our corner of Hampshire!

Thank you in advance for any ideas :)

Hope the sound links work . . . .

soundcloud.com/.../s-FQaWNZ6s5lu